This is a variation of the endless staircase illusion constructed out of legos. Like the the blivet, this is also an impossible object and is sometimes called the “Penrose triangle”.
Stare at the center of the image for about 30 seconds and then look away at a preferably white surface (sometimes the ceiling works). What do you see?
This illusion was named after Johann Karl Friedrich Zöllner and consists of parallel lines that appear to be diagonal. You may need a ruler for this one.
Although the two red lines seem to be bowed outwards they are perfectly straight and parallel. This illusion is attributed to Ewald Hering, a German physiologist who believed that the distortion was derived from the mind overestimating the angles at the points of intersection.
Also known as the Ebbinghaus Illusion, there is still a debate in psychological circles as to the exact mechanism and implication of this effect. Essentially, however, the orange circle on the left appears to be smaller than the one on the right although in reality they are the same size.